Austrian composer Peter Ablinger digitized a recording of a child speaking and then programmed a mechanical piano to replicate the sounds. The video above is in German, but Hack a Day has provided a translation:

I break down this phonography, meaning a recording of something the voice, in this case -, in individual pixels, one can say. And if I have the possibility of a rendering in a fairly high resolution (and that I only get with a mechanical piano), then I in fact restore some kind of continuity. Therefore, with a little practice, or help or subtitling, we actually can hear a human voice in a piano sound.

The content of the speech is taken from the Proclamation of the European Environmental Criminal Court at World Venice Forum 2009.